Red and ultraviolet flame detector with multiple safety redundancy and explosion-proof control method

Abstract

The invention discloses an infrared and ultraviolet flame detector with multiple safety redundancy and an anti-explosion control method, and relates to the technical field of flame detection, and the anti-explosion control method comprises the steps: S1, obtaining the multi-source fire data of a target object through a signal obtaining module; s2, analyzing the multi-source fire data through a dynamic coupling adjustment module; s3, performing time domain association verification on the first monitoring data through a time domain continuity verification module, and generating second monitoring data; and S4, the grading execution module sends an alarm signal according to the second monitoring data and adopts grading execution processing. Through ultraviolet polarization degree and dielectric constant dual-threshold triggering, interference of the metal reflective layer is stripped, so that the smoldering detection rate of a covered scene is increased from less than or equal to 60% to more than or equal to 95%; and moreover, the smoldering authenticity is subjected to cross validation through the bidirectional verification module, so that the problem of missing report of a traditional flame detector caused by a covering effect of'reflective interference 'on'smoldering monitoring' is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of flame detection technology, and particularly relates to a red-ultraviolet flame detector with multiple safety redundancies and an explosion-proof control method. BACKGROUND

[0002] In the field of fire detection technology, traditional infrared and ultraviolet fire detectors have significant functional limitations. The working principle of such devices determines that they can only respond to the radiation spectrum of a certain specific wavelength range in the infrared or ultraviolet band emitted by burning flames.

[0003] However, the actual fire occurrence scenarios in life are extremely complex, and the characteristics of different materials when burning are vastly different: when solid combustible materials such as wood and cloth burn, they will release radiation of the above-mentioned specific wavelengths, accompanied by a large amount of smoke particles and a complex heat release process; while high molecular materials such as plastics and rubbers burn, they will not only produce a variety of toxic gases, but their light radiation may also contain a large amount of non-specific band stray light.

[0004] Chinese Patent No. 202410097560.7 discloses a multi-spectral flame detection system based on spectral feature data fusion. The invention first uses an infrared intensity detection module and an ultraviolet intensity detection module to detect the infrared intensity and ultraviolet intensity in the environment. Compared with temperature sensors and smoke sensors, it can be used for flame detection in more environments, has lower cost, and has a wider range of applications. Second, by utilizing the characteristics of infrared light and ultraviolet light when different materials burn, the type of burning material is screened, and then confirmed through image recognition, which can more accurately determine whether there is a real fire, and improve the accuracy of fire determination.

[0005] However, in outdoor and easily disturbed by environmental light large industrial scenes, flame detectors often face the interference of sunlight, artificial light sources, etc., leading to an increased risk of false positives or false negatives. Even if the infrared sensor cooperates with the ultraviolet sensor to detect, it can to some extent avoid the misjudgment caused by environmental reflection, but it may still misjudge "high-temperature tank body reflection" as flame. Therefore, the monitoring accuracy of single infrared, single ultraviolet, or conventional red-ultraviolet combined flame detectors is limited, and false negatives or false positives often occur. Although the invention will provide an "environmental light source abnormality prompt", it only provides an abnormality prompt, and under frequent light source interference, it will form a high-frequency false positive, which will reduce the trust of the staff in the flame detector.

[0006] And, fire in the very early stage and in closed space or high altitude area, such as aircraft cargo hold and plateau warehouse, the burning of the goods presents the smoldering characteristics due to the lack of oxygen, that is: the infrared / ultraviolet radiation intensity of the flame is significantly reduced, and the flame has not formed obvious strong light radiation, more is the slow release of heat and weak smoke. Only relying on the infrared, ultraviolet detector responding to specific wavelength can hardly capture the effective signal, even if the image analysis system is introduced into the fire prediction system, due to the smoldering without fire, the image analysis system cannot identify whether the object is burning, not to mention distinguishing the category of the burning object.

[0007] In addition, considering the masking effect of "light interference" on "smoldering monitoring", that is, the smoldering characteristics in high reflection environment are masked by strong polarized signal, and the smoldering without fire is difficult to trigger the traditional detector due to the lack of instantaneous light and heat characteristics.

[0008] Therefore, the present application provides a red-ultraviolet flame detector with multiple safety redundancies and an explosion-proof control method to solve the above problems. SUMMARY

[0009] The purpose of the present application is to provide a red-ultraviolet flame detector with multiple safety redundancies and an explosion-proof control method to solve the technical problems of smoldering characteristics being masked by strong polarized signal in high reflection environment, and smoldering without fire being difficult to trigger the traditional detector due to the lack of instantaneous light and heat characteristics in the background art.

[0010] To achieve the above purpose, the present application provides the following technical scheme: an explosion-proof control method with multiple safety redundancies, comprising the following steps:

[0011] S1: acquiring multi-source fire data of the target object by using a signal acquisition module, and converting the multi-source fire data into corresponding digital signals;

[0012] The multi-source fire data includes:

[0013] The intensity and polarization degree of the environmental ultraviolet light are acquired by using a polarized filter ultraviolet sensor;

[0014] The dielectric constant change of the target is measured by using a millimeter wave radar;

[0015] The three-dimensional thermal gradient vector field of the target area is captured by using a thermal imaging camera;

[0016] S2: analyzing the multi-source fire data by using a dynamic coupling adjustment module to generate first monitoring data, and adjusting the infrared threshold according to the first monitoring data;

[0017] The dynamic coupling adjustment module comprises an ultraviolet polarization degree determination unit and a dielectric constant change amount determination unit. The ultraviolet polarization degree determination unit determines whether the target object has a reflection. The dielectric constant change amount determination unit determines whether the target object has smoldering. When the dynamic coupling module simultaneously detects the reflection feature and the smoldering feature, the bidirectional verification module is activated. The bidirectional verification module is used to solve the problem that the smoldering feature is covered by the strong polarization signal in the high-reflective environment, and the detection false negative problem caused by the lack of instantaneous light-heat characteristics of the smoldering without open fire.

[0018] S3: performing time-domain correlation verification on the first monitoring data by a time-domain persistence verification module, and generating second monitoring data;

[0019] S4: sending an alarm signal and taking a hierarchical execution treatment according to the second monitoring data by a hierarchical execution module.

[0020] Preferably, the infrared threshold is the minimum intensity value of the infrared radiation detected by the infrared sensor. When the actually detected infrared radiation intensity exceeds the threshold, the detector determines that there is a flame or a high-temperature object, otherwise it is considered that there is no flame.

[0021] Preferably, the dynamic coupling adjustment realizes the cooperative processing of the reflection feature and the smoldering feature through a condition-triggered formula.

[0022] Preferably, the ultraviolet polarization degree determination unit comprises:

[0023] When the ultraviolet polarization degree is greater than a first threshold (T1), it is determined that there is a reflection feature, and a millimeter wave radar high-power penetration mode is activated.

[0024] The dielectric constant change amount determination unit comprises:

[0025] When the dielectric constant change amount is greater than a second threshold (T2), it is determined that there is a smoldering feature, and a thermal imaging camera automatic zoom tracking is triggered.

[0026] Preferably, the time-domain persistence verification module comprises reflection interference verification and real smoldering verification.

[0027] The reflection interference verification comprises: when the ultraviolet polarization degree is greater than the first threshold (T1) for more than a first time threshold (t1) and the pulse width is less than a second time threshold (t2), it is marked as environmental reflection interference.

[0028] The real smoldering verification comprises: when the dielectric constant change amount is greater than the second threshold (T2) for more than a third time threshold (t3), and a three-dimensional thermal gradient vector field is greater than a third threshold (T3), it is marked as real smoldering.

[0029] Preferably, the bidirectional verification module comprises forward verification and reverse verification.

[0030] The forward verification includes: penetrating the reflective interference layer by the millimeter wave radar high-power mode to obtain the true value of the permittivity change amount of the covered area;

[0031] The reverse verification includes: verifying whether the heat diffusion trend of the permittivity abnormal area matches the smoldering characteristics by thermal imaging zoom tracking;

[0032] If the permittivity change amount of the forward verification is greater than a second threshold T2 and the three-dimensional thermal gradient vector field of the reverse verification is greater than a third threshold T3, it is marked as "real smoldering under reflective cover";

[0033] If the results of the forward verification and the reverse verification conflict, a multi-band infrared sensor is started to detect the carbon dioxide absorption peak for secondary verification.

[0034] Preferably, the hierarchical treatment in S4 includes:

[0035] When the reflective interference is confirmed, the detection sensitivity of the target area is reduced, and the reflective coordinates are sent to the monitoring system;

[0036] When the smoldering fire is confirmed, the inerting system is started and the target position is locked, and the heat diffusion situation map is updated periodically.

[0037] Preferably, the second threshold T2 is dynamically corrected according to the material type of the target.

[0038] Preferably, in the bidirectional verification, the millimeter wave radar high-power penetration mode uses frequency tuning continuous wave (FMCW) technology to strip the reflective interference layer artifacts by comparing the difference in permittivity spectrum before and after penetration.

[0039] A red-ultraviolet flame detector with multiple security redundancies, comprising:

[0040] A signal acquisition module for collecting multi-source fire data of a target, including:

[0041] A polarized light filtering ultraviolet sensor for acquiring environmental ultraviolet intensity and polarization degree;

[0042] A millimeter wave radar module for measuring the permittivity change amount of the target;

[0043] A thermal imaging camera for capturing a three-dimensional thermal gradient vector field of the target area;

[0044] A dynamic coupling processor configured to:

[0045] (a) When the ultraviolet polarization degree is greater than a first threshold T1, activate the millimeter wave radar high-power penetration mode;

[0046] (b) when the dielectric constant variation > second threshold T2, triggering the thermal imaging camera automatic zoom tracking;

[0047] (c) when the ultraviolet polarization degree > first threshold T1 and the dielectric constant variation > second threshold T2 are met at the same time, starting the two-way verification module;

[0048] The time domain verification module continuously monitors the marking state: if the dielectric constant true value and the heat diffusion matching degree continuously exceed the threshold value for a duration > third time threshold t3, a smoldering confirmation signal is output;

[0049] The hierarchical execution module executes corresponding actions according to the smoldering confirmation signal and the reflection feature signal.

[0050] The beneficial effects of the present application are:

[0051] The present application triggers by ultraviolet polarization degree + dielectric constant double threshold (such as UV polarization > 18° to activate millimeter wave radar high power penetration), peels off the metal reflection layer interference, directly obtains the dielectric constant true value of the covered area, and improves the smoldering scene smoldering detection rate from ≤60% to ≥95%; and, the two-way verification module cross-verification smoldering authenticity avoids the "reflection interference" covering effect on "smoldering monitoring" leading to the false negative problem of traditional flame detector; in addition, based on the thermal imaging depth data, a three-dimensional thermal gradient vector field is constructed, the smoldering carbonization trend angle deviation is quantified, the two-dimensional thermal imaging misjudgment problem caused by object shielding is solved, and the complex scene recognition accuracy is improved by 30%. BRIEF DESCRIPTION OF DRAWINGS

[0052] Fig. 1 The flowchart of the explosion-proof control method with multiple safety redundancies of the present application.

[0053] Fig. 2 The flowchart of the two-way verification module of the present application.

[0054] Fig. 3 The time domain continuity verification flowchart under the two-way verification module of the present application. DETAILED DESCRIPTION

[0055] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0056] Embodiment 1

[0057] In the application process of the existing flame detector, the conventional ultraviolet detector is easily disturbed by strong polarization signals in high-reflective environments such as metal surfaces and glass curtain walls, resulting in a false alarm rate of up to 30%. Moreover, objects lack the instantaneous light-thermal characteristics of flames during smoldering, making it difficult for traditional infrared detectors to trigger. In forest fire prevention systems, smoldering fires are easily disturbed by other heat sources (such as hot rocks and car engines) due to low ground temperatures and high concealment, resulting in a false negative rate of over 40%. In addition, when reflections and smoldering occur simultaneously, strong polarization signals can mask the weak characteristics of smoldering, and existing technologies lack a dynamic coupling mechanism for multiple data sources, resulting in a "double-feature masking effect," where smoldering characteristics are obscured by reflection signals, and reflections are mistakenly identified as open fires. To solve the above problems, the embodiment is invented.

[0058] Referring to Figs. 1 to 3 The explosion-proof control method with multiple safety redundancies according to an embodiment of the present application includes the following steps:

[0059] S1: Obtain multi-source fire data of the target object using a signal acquisition module and convert it into corresponding digital signals.

[0060] The multi-source fire data includes:

[0061] The intensity and polarization degree of environmental ultraviolet light are obtained through a polarization filtering ultraviolet sensor.

[0062] The dielectric constant change of the target is measured by a millimeter wave radar.

[0063] The three-dimensional thermal gradient vector field of the target area is captured by a thermal imaging camera.

[0064] S2: Analyze the multi-source fire data using a dynamic coupling adjustment module to generate first monitoring data, and adjust the infrared threshold based on the first monitoring data.

[0065] The dynamic coupling adjustment module includes an ultraviolet polarization degree determination unit and a dielectric constant change determination unit. The ultraviolet polarization degree determination unit determines whether the target object has reflections, and the dielectric constant change determination unit determines whether the target object has smoldering. When the dynamic coupling module detects both reflection characteristics and smoldering characteristics, the bidirectional verification module is activated. The bidirectional verification module is used to solve the problem of smoldering characteristics being masked by strong polarization signals in high-reflective environments, and the problem of detection false negatives caused by the lack of instantaneous light-thermal characteristics of smoldering without open fires.

[0066] S3: Perform time-domain correlation verification on the first monitoring data using a time-domain persistence verification module to generate second monitoring data.

[0067] S4: The hierarchical execution module sends an alarm signal and takes a hierarchical execution treatment based on the second monitoring data.

[0068] The infrared threshold is the minimum intensity value of infrared radiation detected by the infrared sensor. When the actual detected infrared radiation intensity exceeds the infrared threshold, the detector determines that there is a flame or a high-temperature object, otherwise it is considered to be no flame.

[0069] The dynamic coupling adjustment realizes the cooperative processing of the reflection feature and the smoldering feature through the condition-triggered formula.

[0070] The ultraviolet polarization degree determination unit comprises:

[0071] When the ultraviolet polarization degree is greater than the first threshold T1, it is determined to be a reflection feature, and the millimeter wave radar high-power penetration mode is activated. The first threshold T1 is adjusted according to the surface emission characteristics of the target object. In this embodiment, the first threshold T1 is set to 12°-18°. Non-metal target objects (such as plastic and wood): the first threshold T1 is 12° (the reflection is weak, and the threshold needs to be reduced to avoid missed judgment). Metal target objects (such as steel containers): the first threshold T1 is 18° (the reflection is strong, and the threshold needs to be increased to avoid misjudgment).

[0072] In addition, since the ultraviolet polarization degree of the reflection under strong light is higher, the first threshold T1 needs to be increased, so in this embodiment, when the environmental ultraviolet intensity is greater than 500 μW / cm 2 , the first threshold T1 is automatically increased by 20%.

[0073] Specifically, in the reflection test of the metal plate (reflectivity > 80%), when the polarization degree is greater than 15°, the probability of system misjudgment as smoldering is greater than 30%; when the polarization degree is greater than 18°, the misjudgment rate is reduced to less than 5%.

[0074] The dielectric constant change amount determination unit comprises:

[0075] When the dielectric constant change amount is greater than the second threshold (T2), it is determined to be a smoldering feature, and the thermal imaging camera automatic zoom tracking is triggered. The second threshold T2 is set to 5%-10% of the material baseline value (for example, the air baseline is 1, and the dielectric constant of the plastic smoldering rises to 1.05-1.10). Since T2 is related to the flammability of the material, the second threshold T2 needs to be dynamically corrected according to the material type of the target object, that is: flammable materials (such as cotton and foam): T2 = 5%; difficult-to-burn materials (such as glass fiber): T2 = 10%.

[0076] The time domain persistence verification module includes reflection interference verification and real smoldering verification.

[0077] The reflection interference verification includes: when the ultraviolet polarization degree is greater than the first threshold T1 for more than the first time threshold t1 and the pulse width is less than the second time threshold t2, it is marked as environmental reflection interference.

[0078] Wherein, in the light flickering test, the polarization degree of the instantaneous reflection (such as the frequency flicker of the fluorescent lamp) is > T1, and the duration is usually < 3s; but the duration of the continuous reflection (such as the sunlight irradiation on the fixed metal plate or the moving metal piece) is > 10s, so in this embodiment, the first time threshold t1 = 10s.

[0079] The second time threshold t2 can be corrected according to the frequency of the ambient light, that is, when the frequency of the ambient light < 50Hz, such as incandescent lamp irradiation, t2 is 5s; when the frequency of the ambient light > 100Hz, such as LED lamp irradiation, t2 is shortened to 3s.

[0080] The real smoldering verification includes: when the dielectric constant change amount > the second threshold T2 for more than the third time threshold t3, and the three-dimensional thermal gradient vector field > the third threshold T3, it is marked as real smoldering, wherein the third time threshold is corrected according to the material thermal inertia of the target object, that is: low thermal inertia material (such as foam): t3 = 1 minute (smoldering develops fast); high thermal inertia material (such as concrete): t3 = 3 minutes (smoldering develops slowly).

[0081] The bidirectional verification module includes forward verification and reverse verification.

[0082] The forward verification includes: penetrating the reflection interference layer by the high-power mode of the millimeter wave radar to obtain the dielectric constant change amount true value of the covered area, the transmission power of the high-power penetration mode of the millimeter wave radar is 500m ~ 2W, the working frequency band is 76-81GHz, and the penetration depth is > 30cm (for non-metal containers).

[0083] The reverse verification includes: tracking the heating diffusion trend of the dielectric constant abnormal area by the thermal imaging zoom to verify whether it matches the smoldering characteristics of the target object.

[0084] If the dielectric constant change amount of the forward verification > the second threshold T2 and the three-dimensional thermal gradient vector field of the reverse verification > the third threshold T3, it is marked as "real smoldering under reflection cover".

[0085] If the results of the forward verification and the reverse verification conflict, start the multi-band infrared sensor to detect the carbon dioxide absorption peak for secondary verification.

[0086] Further clarify how to obtain the dielectric constant true value after the above millimeter wave penetration:

[0087] Penetrate the metal reflection layer by the FMCW radar to transmit electromagnetic waves, calculate the dielectric constant change amount Δε after receiving the reflected signal, if Δε > 0.1 and the deviation from the surface measurement value > 30%, determine that it is a reflection cover layer.

[0088] The matching rule of the heating diffusion trend and the smoldering characteristics is supplemented as follows:

[0089] Thermal imaging camera tracks the temperature diffusion rate of Δε anomaly area If The temperature of the target object region rises from 2℃ / cm 2 to 5℃ / cm 2 within 3 minutes, and the diffusion direction conforms to the smoldering fire spread model (such as radial diffusion rate > 0.5 cm / min), the matching is successful.

[0090] The above smoldering fire spread model:

[0091]

[0092] Where, υ r is the radial diffusion rate (cm / min), ΔT is the temperature gradient change, d is the carbonization depth of the material, and v r > 0.5 and the angle deviation < 15°, it is determined that the matching is successful.

[0093] The secondary verification parameters of the above multi-band infrared sensor include:

[0094] When the forward and reverse verification results conflict, start the 4.26 μm band infrared sensor to detect the CO2 absorption peak, if the absorption rate > 60% and lasts for 20 seconds, it is confirmed as smoldering gas characteristics.

[0095] If the millimeter wave radar fails, take the average of the dielectric constant change in the last 5 minutes or directly switch to the multi-band infrared sensor to monitor the CO2 absorption peak; and if the thermal imaging fails, use the dielectric constant change rate instead of the thermal diffusion trend determination (rate > 0.1% / s is considered as smoldering characteristics).

[0096] The hierarchical treatment in S4 includes:

[0097] When the reflection interference is confirmed, reduce the detection sensitivity of the target object region, and send the reflection coordinates to the monitoring system;

[0098] When the smoldering fire is confirmed, start the inerting system and lock the target position, and periodically update the thermal diffusion situation map.

[0099] In the bidirectional verification, the millimeter wave radar high-power penetration mode uses the frequency tuning continuous wave (FMCW) technology, which compares the dielectric constant spectrum difference before and after penetration to strip the reflection interference layer artifacts.

[0100] The FMCW technology parameters and the specific process of penetrating the reflection layer need to be supplemented:

[0101] When the ultraviolet polarization degree > 5°, the FMCW mode of the millimeter wave radar is activated, the emission frequency is linearly tuned between 76-81 GHz, and the dielectric constant spectrum difference before and after penetration is compared (when the spectrum difference D > 0.3, it is determined that the reflection interference is effectively stripped).

[0102] Embodiment 2

[0103] The embodiment also provides a red-ultraviolet flame detector with multiple security redundancies, comprising:

[0104] a signal acquisition module for collecting multi-source fire data of the target object, comprising:

[0105] a polarized filter ultraviolet sensor for acquiring environmental ultraviolet intensity and polarization degree.

[0106] a millimeter wave radar module for measuring the dielectric constant change of the target object.

[0107] a thermal imaging camera for capturing a three-dimensional thermal gradient vector field of the target region.

[0108] The polarized ultraviolet sensor meets the Exia II CT6 explosion-proof certification, the millimeter wave radar adopts optical fiber isolation signal transmission, and the thermal imaging camera has a protection level of IP68.

[0109] a dynamic coupling processor configured to:

[0110] (a) when the ultraviolet polarization degree is greater than a first threshold T1, activate the millimeter wave radar high-power penetration mode.

[0111] (b) when the dielectric constant change is greater than a second threshold T2, trigger the thermal imaging camera to automatically zoom in tracking.

[0112] (c) when the ultraviolet polarization degree is greater than the first threshold T1 and the dielectric constant change is greater than the second threshold T2, start the bidirectional verification module.

[0113] a time-domain verification module for continuously monitoring the marked state: if the dielectric constant true value and the thermal diffusion matching degree continuously exceed the threshold value for a duration greater than a third time threshold t3, output a smoldering confirmation signal.

[0114] a hierarchical execution module for performing corresponding actions according to the smoldering confirmation signal and the reflection feature signal.

[0115] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can make equivalent replacements or changes within the technical range disclosed by the present application according to the technical solution and inventive concept of the present application, which should be covered within the protection scope of the present application.

Claims

1. An explosion-proof control method with multiple safety redundancies, characterized by, The method comprises the following steps: S1: acquiring multi-source fire data of the target object by using a signal acquisition module, and converting the multi-source fire data into corresponding digital signals; The multi-source fire data comprises: The intensity and polarization degree of environmental ultraviolet light are acquired by using a polarized filter ultraviolet sensor; The dielectric constant variation of the target object is measured by using a millimeter wave radar; A three-dimensional thermal gradient vector field of the target region is captured by using a thermal imaging camera; S2: analyzing the multi-source fire data by using a dynamic coupling adjustment module to generate first monitoring data, and adjusting an infrared threshold according to the first monitoring data; The dynamic coupling adjustment module comprises an ultraviolet polarization degree determination unit and a dielectric constant variation determination unit, the ultraviolet polarization degree determination unit determines whether the target object has a reflection, the dielectric constant variation determination unit determines whether the target object has a smoldering, and when the dynamic coupling module detects the reflection feature and the smoldering feature at the same time, a bidirectional verification module is activated, the bidirectional verification module is used to solve the problem that the smoldering feature is covered by the strong polarization signal in the high-reflective environment, and the detection of the smoldering without a fire is missed due to the lack of instantaneous light and heat characteristics; S3: performing time-domain correlation verification on the first monitoring data by using a time-domain persistence verification module to generate second monitoring data; S4: sending an alarm signal and taking a hierarchical execution treatment according to the second monitoring data by using a hierarchical execution module.

2. The explosion-proof control method with multiple safety redundancies according to claim 1, characterized in that, The infrared threshold is the minimum intensity value of the infrared radiation detected by the infrared sensor, when the actual detected infrared radiation intensity exceeds the threshold, the detector determines that there is a flame or a high-temperature object, otherwise it is considered that there is no flame.

3. The explosion-proof control method with multiple safety redundancies according to claim 2, characterized in that, The dynamic coupling adjustment realizes the cooperative processing of the reflection feature and the smoldering feature by using a conditional trigger formula.

4. The explosion-proof control method with multiple safety redundancies according to claim 3, characterized in that, The ultraviolet polarization degree determination unit comprises: When the ultraviolet polarization degree is greater than a first threshold (T1), it is determined that there is a reflection feature, and the millimeter wave radar high-power penetration mode is activated. The dielectric constant variation determination unit comprises: When the dielectric constant variation is greater than a second threshold (T2), it is determined that there is a smoldering feature, and the thermal imaging camera is triggered to automatically zoom in and track.

5. The explosion-proof control method with multiple safety redundancies according to claim 4, characterized in that, The time-domain persistence verification module comprises reflection interference verification and real smoldering verification. The reflection interference verification comprises: when the ultraviolet polarization degree is greater than the first threshold (T1) for more than a first time threshold (t1) and the pulse width is less than a second time threshold (t2), it is marked as environmental reflection interference. The real smoldering verification comprises: when the dielectric constant variation is greater than the second threshold (T2) for more than a third time threshold (t3), and the three-dimensional thermal gradient vector field is greater than a third threshold (T3), it is marked as real smoldering.

6. The explosion-proof control method with multiple safety redundancies according to claim 5, characterized in that, The bidirectional verification module comprises forward verification and reverse verification. The forward verification comprises: penetrating the reflection interference layer by using the millimeter wave radar high-power mode to obtain the dielectric constant variation true value of the covered area. The reverse verification comprises: verifying whether the heating diffusion trend of the dielectric constant abnormal area matches the smoldering characteristics by using the thermal imaging zoom tracking; If the dielectric constant variation of the forward verification is greater than the second threshold (T2) and the three-dimensional thermal gradient vector field of the reverse verification is greater than the third threshold (T3), it is marked as "real smoldering under reflection cover"; If the results of the forward and reverse verifications conflict, a multi-band infrared sensor is activated to detect the carbon dioxide absorption peak for secondary verification.

7. The explosion-proof control method with multiple safety redundancies according to claim 6, characterized in that, The hierarchical treatment in S4 includes: When the reflection interference is confirmed, the detection sensitivity of the target area is reduced, and the reflection coordinates are sent to the monitoring system; When the smoldering fire is confirmed, the inerting system is activated and the target position is locked, and the thermal diffusion situation map is updated periodically.

8. The explosion-proof control method with multiple security redundancies according to claim 7, characterized in that, The second threshold value (T2) is dynamically corrected according to the material type of the target object.

9. The explosion-proof control method with multiple safety redundancies according to claim 8, characterized in that, In the bidirectional verification, the millimeter wave radar high-power penetration mode uses frequency tuning continuous wave (FMCW) technology to strip the reflection interference layer artifacts by comparing the dielectric constant spectrum difference before and after penetration.

10. A red-UV flame detector with multiple safety redundancies, using the explosion-proof control method with multiple safety redundancies according to any one of claims 1-9, characterized in that, It includes: The signal acquisition module is used to collect multi-source fire data of the target object, including: The polarized light ultraviolet sensor acquires the intensity and polarization degree of the environmental ultraviolet light; The millimeter wave radar module measures the dielectric constant change of the target object; The thermal imaging camera captures the three-dimensional thermal gradient vector field of the target area; The dynamic coupling processor is configured to: (a) When the ultraviolet polarization degree is greater than the first threshold value T1, activate the millimeter wave radar high-power penetration mode; (b) When the dielectric constant change is greater than the second threshold value T2, trigger the thermal imaging camera to automatically zoom in tracking; (c) When the ultraviolet polarization degree is greater than the first threshold value T1 and the dielectric constant change is greater than the second threshold value T2 at the same time, start the bidirectional verification module; The time domain verification module continuously monitors the marked state: if the dielectric constant true value and the thermal diffusion matching degree continuously exceed the threshold value for a duration greater than the third time threshold value t3, output a smoldering confirmation signal; The hierarchical execution module executes corresponding actions according to the smoldering confirmation signal and the reflection feature signal.

Images